In the event of a major war with China or Russia, the U.S. Navy, almost half the size it was during the height of the Cold War, is going to be busy with combat operations. It may be too busy, in fact, to always escort the massive sealift effort it would take to transport what the Navy estimates will be roughly 90 percent of the Marine Corps and Army gear the force would need to sustain a major conflict.

That’s the message Mark Buzby, the retired rear admiral who now leads the Department of Transportation’s Maritime Administration, has gotten from the Navy, and it’s one that has instilled a sense of urgency around a major cultural shift inside the force of civilian mariners that would be needed to support a large war effort.

“The Navy has been candid enough with Military Sealift Command and me that they will probably not have enough ships to escort us. It’s: ‘You’re on your own; go fast, stay quiet,’” Buzby told Defense News in an interview earlier this year.